Valve-grinding machine



A. C. MORK.

VALVE GRINDING MACHINE. -APPLzcATloN HLED1uLvl2.z919.

Patvented Jau. 13, 1920.

2 SHEETS--SHEET l.

@l Si projected arms 22a that arebifurcated and provided with rollers23. Arms 22a Work between laterally spaced side plates of the respectivebracket 12 and thereby hold the sleeves 22 against rotation withrespective tubular spindle 14.4 The Said sleeves 22, however, aiecausedv to'inove vertically with the respective tubulai spindle andcoperating stein 15. To cause this common vertical movement, the sleeves22 are held between shoulders on the upper portion of the respectivetubular spindle 14 and nut 2-l applied to the extreme lower ends of saidtuular spindle, (see particularly Fig. et).

The roller 23 of the several sleeves 22 are operated upon by cains 25that are keyed to rotate with, but to slide on commonshaft 28 ontheguide bar 1l, and is 26. Shaft 26 is journaled in bearings 27 andextended through laterally spaced guide plate portion 12a of the severalbearing heads. The connections between the shaft 26 and cams 25',

I peri'nit the said cams to slide freely on said then' in the other.

shaft, and such movements oflthe cams are `produced by the slidingmovement of the respective bearing heads. Otherwise stated, the cams arealways held in properl coperative relation to the respective bearinghead yand parts carried thereby.

The bearing 27 is preferably in the, form afa yoke and is `fixed to theright hand end` oftlix guide bar 11, as shown in Fig. 1. To the rightyhand end of shaft 26 is secured a beveled gear `29 that meshes with abevel ear 30 secured on a short shaft- 31 mounted in the bearing bracket27. The inner end of shaft 31 is provided with crank arm 32 equipped litits end with a 'roller 33, but works in the vertically elongated slot ofa head 34that is pivoted tothe right hand end of the bar 21.

At its front end the slot 21 is provided with an operating handle orcrank lever 35 by means of which it may be hand operated. In a powerdriven machine, however a pulley n'iay be substituted for this handcrank 35. For an important purpose, the gears 29 and 30 are made ofunequal diameter, preferably teeth differing in number and having nocommon factor. When shaft 31 is rotated by crank 35, crank 32 will moverack bai- 21 longitudinally along the supporting bar 11, and suchmovement of said rack will cause a gear19 to make approximately eomlilet'e rotation, first in the one direction and Such rotary movementsof the said figure Will cause the stems 15 and 18 to make correspondingoscillation anti when the end of stem 18 is engaged with the valves,said valves will also, of course, be correspondingly oscillated. Thevalves, as is well known, are spring-pressed upward so that they risefrom their seat when pressure isreleased therefrom. vWhen the rollers23ar ride upon the concentric portions of the cam 25, springs 14?, whichare compressed between the upper arms of the respective head 12 andshoulders on the cooperating nonrotary sleeves 22,- serve to overcomethe' springs of the several valves and force the said valves againsttheir seats so as to produce the grinding action. The valves will beheld totheir seats, and the grinding action produced throughout about.three-fourths ofsov As camshaft 26 is rotated at higher speed than cani31 and crank arm 32, thepoint at which the cams will allow the valves todrop against their seats, will be continuously advanced and a grindingaction continuously shifted. With the described beveled gear connectionbetween shafts 21 and 26, there will 'be no repetition or, at least, nofrequent repetition of grinding action throughout exactl y the saine oneThis machinewill therefore, produce a `better grinding action than canbe produced by hand.

By sliding adjustments of theseveral heads on the supporting '-bar 11,the several valve grinding devices may be ,properlyspaced to come intoposition over the several valves of the engine. The `valvesrof the enincare,,;is"iswell known, always located' in direct line'so that the aboveadjustments of the grinding device is possible. In actual practice theefficiency of this valve, grinding device has `been demon-- strated.

What I claim is: y 1. A valve grinding machine comprising a supportingbar having mea-ns for attaching the same to a cylinder casting,supporting heads adiustable on said supporting bar, valve engaginggrinder stems mounted iii .said head for rotary.4 and verticalmovements, springsyieldingly 'forcing saidv grinder stems downward,gears rotatable with the said stenis,.a rack bar slidably mounted inrespect to said supporting baiand engaging the several gears, 'a camshaft supported fromf said bar and extending along the several heads,cams rotatable with, but slidable on said cam shaft, and

non-rotary cam engaged -devices movable.

'vertically With the `several grinder stems, said head havingwebs thatembrace the respective cams and cause the sameto move` therewith alongsaid cam shaft.

2. A v-alvegrinding machine comprising -a supporting bar having meansfor attaching` the same to a cylinder casting, supporting headsadjustable on said supporting bar, valve engaging-grinder stems mountedin said head for rotary and vertical movemergers ments, springsyieldingly fencing said grinder stems downward, gears rotatable with thesaid stems, a rack bar slidably mounted in respect to said suppertingoar and engaging tiie several pinionsj a cem shaft vifrem said ear andestending along the several heads, earns rotatable .with but slidable onsaid earn shalta nonrotaiy earn engaged devises movable vertically withthe several grinder stems, a drive Shaft having a eranl operative toreeipre- "este rack' oarg and, ,sears ooeiieeting said latter shaft tosaid earn sh the same.,

A valve grinding ina-elaine eomgrising a supporting liar having meansior attaeliing the vsaiooe to a" cylinder easting` supportingheadsadjustalile on said supporting bar, valve engaging grinder steinemounted in said head for rotary and vertical move ments, springs Yyieldingly forcing said grinder stems downward, gears rotatable with thesaid stems, a rack bar slidably mounted in" respect te said supportingbar and engaging the several gears, cani shaft supported from said barand extending alena* the several heads, earns rotatable vcfitli.,` butslidable on said cam sliai't, nonr'otary cam engaged devices movablevertisally with the several grinder stenis, a shaft having a erankoperative to reeipreeate raul; bar, gears connecting said two shafts forrotating said ain shaft, the said gears be ing ont equal diameter sothat the earn action will be shifted in respect to 'the rack movement 4ln a valve grindingmachine the eenibination. with a supporting bar andmeans for securing the same to the cylinder casting of an engine, of aplurality support 1 rotating ing heads slidalily mounted on saidsupporting'liar, a vertically movable lgrinding stem mount i in eaelibearing head, a gear xed aga vertieal movements, but rotatable wat.,saale suoli grinder stein, a rack bar slidalely mounted en. said.Asiipporting liar and. meshing with said several. gears, a cam' sleaztsim rted freni said supporting and extern :d along tl "ral bearingheadsy eams on said .m i siidzible thereon, tat rotatable therewnon-rotar" sleeve etirroimdisg eaeli grinder stein A ani vertieailjfmovable therevvitlaa said( sleeves having arms subject to the respectivecams, springs yieldingly pressing said sleeve and stems downward, adriving shaft mounted on a part lcarried by said support ing Tear andhaving a crank at its inner end equipped with a crank pinengageable witha head on said rack to ieeipreeate the latter', and bevel gearseonneetine; said driving sliat;v to said cam shaft ior rotating thelatter, the said bearing heads having laterally spaced webs that holdsaid sleeves against rotation and canse the respective cams to slidetlierei 5. ln a valve grinding machine the combination .vitli asupporting bar and means :for securing the saine to the cylindertraetion of an engine @if a plurality ot' supporting heads slidablymounted on said sup# porting liar, a vertically movable grinder stemmounted in each bearing head, a gear fixed against vertical movements,out rotatable with each such, grinder stem, a rack bar slidably mountedon said .supportingl bar and meshing;l with the several gears, a camslxait supported 'from said supporting bar and extended along theseveral bearing heads, sains on said Cani shaft slidable thereon.3 butrotatable therewith, a non-rt tary sleeve surrounding each 'grinder stemand vertieally movable therewith, said sleeves having arms subject tothe .respec-4 tive cams, s'irings yieldingiy pressingl said sleeve andSteins downward, driving shaft mounted on a part Carried by said suppering bar and having a crank at its in-l ner ends equipped with a eranl;pin engageable with a 'head on said rack to reciprocate' the latter andbevel vgea-rs connecting .said driving shaft to said cam shaft orrotating the lat-ter, the. said bearingheads `having `laterally 'spacedwebs that hold said sleeves

